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Three types of available common damping materials were used: polyurethane foam, polyurethane foam with aluminum foil and bitumen sheet.
The foam materials decrease the transmissibility gain and thanks to low stiffness have small influence on eigen frequencies (Fig. 2 and Table 2).
The goal is to evaluate loss factor in each eigenmode of the used materials.
The foam materials decrease the gain and shift the natural frequencies slightly.
Kundra, Finite element model updating with damping identification, Journal of Sound and Vibration 324 (2009) 1111-1123

Materials Research, 8(2005) 409-415
Materials Science and Engineering A, 629(2015) 8-15
Materials & Design, 38(2012) 7-18
International Journal of Fatigue, 23(2001) 441–448
Science of Advanced Materials, 9(2017) 188-192

Numerical results of the model accord well with experimental results at the material and structural levels.
Introduction Experimentally, concrete materials or structures exhibit some phenomena observed, such as decrease in material stiffness due to cracking, stiffness recovery which occurs at crack closure, softening behavior after peak strength, irreversible deformations after unloading, anisotropy induced by growth of microcracks and asymmetric behavior of under tension and compression, etc.[1-3].
Damage and plasticity theories are well established under theoretical frameworks for these macroscopic modeling of concrete like materials.
For evaluating its validity, several examples at the material and structural levels are provided.
Shah: ACI Materials Journal Vol.82 (1985), p. 310 [3] D.M.

Nonaka, A dynamic theory of organizational knowledge creation, Organization Science, 4 (1994) 14-37
Barney, Firm resources and sustained competitive advantage, Journal of Management, 17 (1991) 99-120
, Strategic Management Journal, 24 (2003) 745-761
, Journal of Product & Brand Management, 15 (2006) 435 – 441
Companies, Journal of Product Innovation Management, 25, 6 (2008) 620–631.

Analysis was performed, according to the following test methods and activities: non-destructive testing, visual inspection, radiographic testing, chemical analysis of screws sample materials, mechanical properties of screws' materials.
Next, investigation of mechanical properties of materials screws (yield stress, tensile strength, elongation, hardness and contraction of cross section) was done.
This result indicates that the materials of these screws deformation strengthened to a greater extent during operation compared to the other two used unbroken screws.
Fracture surfaces of broken screws are combined action of metallurgical instability of materials and operating conditions.
Unfavorable structure of materials and pre-existing mechanical damage in the root zone threading screws affect the expansion of existing cracks to the final fracture.

Recent decades have witnessed extensive research activity into the advanced engineering of nanoporous materials, from fundamental studies to applied science.
"Carbon materials for the electrochemical storage of energy in capacitors.”
Feldberg, Journal Electrochemical Society 134, 271 (1987)
Gottesfeld, Journal of Power sources 47, 89 (1994)
Snurr RQ Mircroporous and Mesoporous Materials 2002, 56:55; McMillan SA, Broadbelt LJ, Snurr RQ Journal of Phys.

At present, the approach of obtained the ceramic drawing die materials are mainly thermal spraying, CVD, etc.
The project obtained ceramic drawing die materials by laser alloying is a green manufacturing, while it formed metallurgical bonding with the substrate which has high combined strength, and the development prospects is broad.
The project not only has some innovative research but also have economic, social as well as academic significance; This project combined the fields of machinery, materials and laser technology which can promote the integration of various disciplines and development, so it has important applications and academic value.
References [1]Vaziri,A.; Shahverdi, H.R.; Shabestari, S.G.; Torkamany, M.J.; Effect of beam interaction time on laser alloying with pulsed Nd-YAG laser; Materials Science and Technology, Volume 25, Number 10, October 2009 , pp. 1234-1237(4)
[2]Xiao-bin Zhang, Chang-sheng Liu, Xiao-dong Liu, Jiang Dong and Bo Yu; Cavitation erosion behavior of WC coatings on CrNiMo stainless steel by laser alloying; International Journal of Minerals, Metallurgy and Materials Volume 16, Issue 2, April 2009, Pages 203-207

Drill breakage can easily appear because of the block up of cutting scrap, the abrupt change of material, tool wear, etc.
Duan: Natural Science Journal of Harbin Normal University, Vol. 20, No. 2 (2004), pp. 76-79
Zhang: Journal of Yantai University (Natural Science and Engineering Edition), Vol. 22, No. 1 (2009), pp. 72-75
Lv: Natural Science Journal of Jilin University of Technology, No. 4 (1999), pp. 67-71
Wu: Science Education, No. 1 (2006), pp. 52.

Acknowledgement This research was supported by National Natural Science Foundation of China (Grant No. 61173180 and 61070235).
Birgin, J.M.Martinez, D.P.Ronconi,“Optimizing the Packing of Cylinders into a Rectangular Container: A Nonlinear Approach,” European Journal of Operational Research, vol.160(1),2005,pp.19–33
“Solving circle packing problems by global optimization: Numerical results and industrial applications,” European Journal of Operational Research, Vol 191(3), 2008, pp. 786-802
“A Critical Element-Guided Perturbation Strategy for Iterated Local Search”, Lecture Notes in Computer Science, vol 5482, 2009, pp.1-12
[16] Huang Wenqi, Zeng Zhizhong, Fu Zhanghua, Ruchu Xu, “A new algorithm for packing unequal disks in a larger circle”, to be published in American Journal of Engineering and Technology Research.

Study on the Diffusion Coefficient in NGS under Low Tensile Stress Qiao Ying-jiea, Fu Hong-bob, Li Chun-kai College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China aqiaoyingjie@hrbeu.edu.cn, bfuhongbo@hrbeu.edu.cn, Keywords: Diffusion coefficient; non-equilibrium grain-boundary segregation (NGS)；phosphorus; low tensile stress Abstract.
Introduction The subject of the grain-boundary segregation of solute has attracted considerable attention, since it is widely recognized that such solute segregation not only control many of the mechanical, chemical and electronic properties of technologically important materials, but also induce grain boundary structural transformations.
Xu, Progress in Materials Science, 49 (2004) 109 [2] T.
Xu, Journal of Materials Science.
Fu, Key Engineering Materials, Vols. 353-358 (2007) pp. 396-399